Call the Flock

Easy way:

Pick up the daily Call the Flock (if it's available).

Use the feather to turn yourself into the bird.

Abandon the quest.

Now you can pick up as many birds as you want and never have to abandon. I finished with 72 Soar.

Did this today on my druid.

Found that each bird grants different amounts of [spell=100957] towards Ludicrous Speed
Hawks - 15-------- x2 = 30
Owls - 5------------ x5 = 25
Songbirds - 1----- x12 = 12

Which gives you a total of 67 so you have a buffer zone of 2 Songbirds (If they where the first birds you got)

With that in mind I found it easy to start at a high point close to a Hawk and then grabbing another Hawk asap (I think its 7secs between each before it resets and you have to abandon and get the quest again). After that onto an Owl and any Songbird near it, then keep traveling towards another tree whether it has Songbirds or Owls.

One thing to note: I found out that once you have taken 2 Hawks or 5 Owls or 12 Songbirds that they will no longer count towards the achievement

Hope this helps as it can be very annoying. Hang in there and don't forget if you have your Soar reset to 0 you'll have to abandon and start again..

4 hawks and an owl = done.